Process of making barium chlorid.



srs ATENI clarion.

HENRY A. GARDNER, OF WASHINGTON, DISTRICT OF COLUMBIA.

PROCESS OF MAKING BARIUM CHLORID.

No Drawing.

Chlorid, of which the following is a specification.

This invention relates to processes of making barium chlorid, the object being to provide a process whereby barium chlorid may be prepared from barium sulfate and calcium chlorid, with higher yields than have heretofore been obtainable.

It is known that when bariumsulfate and calcium chlorid are heated insubstantially molecular proportions, a certain amount of barium chlorid is formed according to 'the reaction BaSO +CaCl =OaSO +BaCl,.

The reaction is however incomplete; and

, moreover,'when it is attempted to extract the barium chlorid by water, the calcium sulfate dissolves progressively, and a reaction tends to occur in the reverse sense, v1z.:

CaS' D +BaCl =BaSO +CaCl .yields of barium chlorid are very largely increased.

The following examples illustrate this. In all cases, equimolecular mixtures of ba rium sulfate and calcium chlorid were used,

and the extraction of the barium chlorid and thefiltration of the solution from the "un- Specification of Letters Patent.

Patented July 13, 1915.

Application filed January 20, 1915. Serial No. 3,380.

dissolved residue was quickly as practicable Example IzThe'mixture was heated to about 800 (1, or as nearly as possible to the fusing point, then cooled, ground and extracted with water. There was no substantial evolution of sulfur trioxid. The yield of barium chlorid was 45.30 per cent. of the theoretical amount.

Example II: The mixture was heated to accomplished as full fusion, or about 900 C. The loss of sulfur trioxid was five per cent. of the total SO content of the mixture, and the yield of barium chlorid was 56.5(1 per cent. of the theoretical. i I Example III: The mixture was maintained in fusion for minutes at about 1100 C. The loss of SO was not determined. The yield of barium chlorid was aplproximately 70 per cent. of the theoretica "Example IV: The mixture was maintained in fusion for minutes at about 1200 C. The. loss of sulfur trioxid was 30 per cent. of the total SO content, and the yield of barium chlorid was approximately 80 per cent.

Instead of cooling and grinding the melt as above described, the fused mass may be poured directly into water, instantly cooled and granulated, and the insoluble portions separated either by settling or filtration. The clear solution of whereby it is' barium chlorid thus obtained yields on evaporation commercially pure crystals.

I cla1m:- '1. The process of making barium chlorid,

which consists in heating a mixture containing barium sulfate and calcium chlorid until acid productsare evolved and the mixture becomes basic, and then extracting the barium chlorid.

2. The process of making barium chlorid, which consists in maintaining a mixture containing barium sulfate and calcium chlorid in full fusion until acid products areevolved' and the melt becomes basic, then 5 taining barium sulfate and calcium 01110- mi to a temperature 1n excess of 1,000 C.,

and thereafter extracting barium chlorid from the product.

4. In a process of making barium chlorid,

10 the step which consists in fusing a mixture containing barium sulfate and calcium chloricl, pouring the melt into water, and separating the dissolved barium chloricl from the undissolved residue.

In testimony whereof I afiiX my signature in presence of two witnesses.

HENRY A. GARDNER. Vitnesses:

C. W. FOWLER, N. P. LEONARD. 

